“Activision really knows how to do it big, right?” proclaimed Usher during his lively set at Activision’s E3 2010 preview event. They sure do. The video game developer spared no expense pulling out the stops for Ursh, who danced his way through “Caught Up,” “Love in This Club,” “Yeah!,” and “OMG” with surprise guest will.i.am. We’ve got your inside pass on Rap-Up TV.